CN115102174A - Inter-grid power mutual-aid method for active distribution network - Google Patents

Abstract

The invention discloses a method for mutually supplementing power among grids of an active distribution network; the electric field load is primarily distributed by fully considering the power protection level and the historical load capacity of the power protection area; meanwhile, load consumption data in the circuit are collected in real time, a surrounding grid interval is selected according to the load consumption state of the circuit to redistribute charges, factors such as self electric quantity and electricity-preserving grade need to be considered for charge redistribution, and power mutual aid of all areas on the active power distribution network is completed while the electricity-preserving area is guaranteed to supply power preferentially.

Description

A power mutual aid method between grids for active distribution network

technical field

The invention relates to the field of active distribution network, in particular to a method for power mutual aid between grids of active distribution network.

Background technique

As the peak value of electricity load in the whole society continues to break records, the pressure on power grid peak regulation is increasing day by day. Due to the development of science and technology in the current stage of society, the electricity consumption is gradually increasing. During the peak period of electricity consumption, the electricity load in some areas is relatively rich, while the electricity load in some areas is seriously insufficient, and the power plant needs to allocate the two accordingly. , to meet the electricity guarantee for modern work and life.

For example, a “DC power mutual aid method for an AC system fed by multi-circuit UHV DC” disclosed in Chinese patent documents, its bulletin number CN112054550B, through the Thevenin equivalent parameters of the sending end and the receiving end AC system The equivalent PQ node parameters of the sending and receiving sides of the AC side obtained from the quasi-steady-state mathematical model are used to construct the constraint model of the sending and receiving sides of the AC system; under the condition of multiple constraints, the maximum value of active power fed into each DC line is optimized and solved , and according to the current DC operating state and the equivalent inertia of the AC system at the sending end of the DC line, the adjustable capacity of the DC line is corrected, and the frequency current reference droop coefficient of the DC line is calculated accordingly, and the reference value of the DC current of the DC line is calculated. make adjustments. The invention gives full play to the role of power mutual aid between multi-feeding DCs, and enhances the power support capability to improve the stability level and robustness of the receiving-end AC system. However, the power mutual assistance is only for two circuits, and cannot be used for load distribution in multiple circuits, and cannot be adapted to the power mutual assistance in the full distribution network environment of the active distribution network.

SUMMARY OF THE INVENTION

The present invention mainly aims at the problem of insufficient consideration in the load distribution process of the active distribution network in the prior art, which results in the lack of regional electricity but cannot be fed back and supplemented; it provides a power mutual aid method between the grids of the active distribution network; The electric field load is initially allocated according to the power protection level and historical load amount of the power protection area; at the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid intervals are selected according to the load consumption status of the circuit to redistribute the electric charge. Redistribution needs to consider its own power, power protection level and other factors to ensure that the power supply area is given priority to supply power and at the same time complete the power mutual aid of each area on the active distribution network.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

A power mutual aid method between grids of an active distribution network, the method comprising:

Step S1, dividing the station area into different grid intervals according to functions; marking grid intervals; collecting historical information of circuit breakers to obtain load consumption estimation data of each grid interval; performing initial power distribution according to the load consumption estimation data;

Step S2, collecting the real-time information of the circuit breaker to obtain the electricity load of each grid interval; marking the rich grid interval and the deficient grid interval according to the ratio of load consumption and initial allocation data;

Step S3, performing load redistribution on each grid interval load;

Step S4, collecting and redistributing the load consumption information of the current day; adjusting the proportion of the load consumption data of the current day, and re-planning the distribution at the beginning of the next day.

By fully considering the power protection level of the power protection area and the historical load, the electric field load is initially allocated; at the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid interval is selected according to the load consumption state of the circuit to redistribute the charge. , and the charge redistribution needs to consider its own power, power protection level and other factors to ensure that the power supply area is given priority to power supply while completing the power mutual aid of each area on the active distribution network.

Preferably, the steps of initial load distribution are as follows:

S21: A load consumption prediction curve is formed by fitting the historical average daily load change data of users in each grid interval through a clustering algorithm;

S22: Calculate the daily load consumption of each grid interval according to the load consumption estimation curve;

S23: Priority is given to allocating power-preserving areas; other areas are allocated load electricity according to the proportion of daily load consumption.

Since the electricity load is related to the environment in recent days, and the environment generally does not change greatly for several consecutive days, it is necessary to consider the historical load consumption data of the recent period to make an initial allocation of electricity. The power protection area is the priority allocation area.

Preferably, the rich area and the deficient area are divided according to the following method:

Step S31, marking the daily load consumption state in real time, and comparing it with the power consumption in the load consumption estimation curve;

Step S32, if the real-time power exceeds the predicted power of the load consumption prediction curve, then mark the time point and record the time period exceeding the predicted power, and this time period is accumulated and recorded as _t1 ; if the real-time power is lower than the load consumption prediction curve prediction power 5 % or more; then mark the time point and record the time period lower than the predicted power, and the accumulated time period is recorded as t ₂ ;

Step S33: If t ₁ is greater than two hours, mark the interval as a deficient grid interval; if t ₂ is greater than two hours, mark the interval as a rich grid interval.

When the power consumption of the starved grid interval exceeds the expected power consumption, even a small power gap is enough to cause a power outage and thus affect the quality of life, so this time needs to be marked. However, the rich electricity in the rich grid area will not affect daily work, and this area needs to maintain a certain amount of electricity, so it needs to exceed 5% to be recorded as the rich grid area.

Preferably, the power protection areas are ranked as follows: hospital>school>factory>commercial area=residential area, and the power protection areas that need power protection are divided according to the importance level.

Preferably, the load redistribution method for the starved grid interval is as follows:

Step S51, according to the active distribution network topology, obtain the location, energy storage capacity and load accommodation information of the grid interval around the deficient grid interval;

Step S52, judging whether the surrounding grid interval is a deficient grid interval; the surrounding deficient network interval does not participate in this load redistribution;

Step S53, judging the power protection level of the grid interval; if the power protection level is higher than the deficient grid interval, do not participate in the load redistribution; if the power protection level is lower than the deficient network interval, weighted proportioning according to the power protection level ;

Step S54, analyzing the energy storage capacity in the grid interval participating in this load redistribution; determining the redistributed load capacity according to the energy storage capacity;

Step S55 , redistribute the load to the deficient grid interval according to the optimal load absorbing path.

In the grid area that is deficient, it is necessary to first determine the type of the surrounding area. Since the power protection level has priorities, it is necessary to compare the power protection level of the grid area before allocating the power.

Preferably, the method for redistributing load capacity to confirm the starved grid interval and its surrounding grid interval is as follows:

Step S61, collecting the load consumption information of the surrounding grid intervals; let the number of grid intervals participating in the allocation be N;

Step S62, the allocation amount of each grid interval is allocated according to the following formula:

Among them, Q is the required load in the grid-scarce interval; λ ₁ , λ ₂ , λ ₃ , λ ₄ , λ ₅ , and λ ₆ are the factory load weighting coefficient, the commercial area load weighting coefficient, the residential area load weighting coefficient, the school load weighting coefficient, respectively. Load weighting factor, hospital load weighting factor and other places load weighting factor;

a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , and a ₆ are the ratio of the remaining load of the factory to the initial distribution load of the factory, the ratio of the remaining load of the commercial area to the initial distributed load of the commercial area, and the remaining load of the residential area. The ratio of the load to the initial allocated load of the residential area, the ratio of the remaining load of the school to the initial allocated load of the school, the ratio of the remaining load of the hospital to the initial allocated load of the hospital, and the remaining load of other places and the initial allocated load of other places proportion;

Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ , and Qi are respectively the factory load, the commercial area load, the residential area load, the school load, the hospital load, and the load at the _i -th other place;

Among them, λ _j a _j Q _j is the redistributed charge amount for each grid interval; j takes the value from 1 to N.

The grid load power is proportioned according to the conditions of different grid intervals. The lack of grid intervals needs to obtain the load power from the outside, so the power needs to be adjusted to a certain extent.

Preferably, the load redistribution method in the rich grid interval is as follows:

Step S71, according to the active distribution network topology, obtain the location, energy storage capacity and load accommodation information of the grid interval around the rich grid interval;

Step S72, judging whether the surrounding grid interval is a rich grid interval; the surrounding rich grid interval does not participate in this load redistribution;

Step S73, judging the power protection level of the grid interval; if the power protection level is higher than the rich grid interval, the priority is to participate in load redistribution; if the power protection level is lower than the wealthy network interval, the weighted allocation ratio is based on the power protection level ;

Step S74, analyzing the energy storage capacity in the grid interval participating in the load redistribution; determining the redistribution load capacity according to the energy storage capacity;

Step S75 , redistribute the load to each grid interval around the rich grid interval according to the optimal load absorbing path.

The rich grid interval needs to determine the surrounding type first. Since the power protection level has priorities, it is necessary to compare the power protection level of the grid interval before allocating the power.

Preferably, the method to confirm the redistribution load capacity of the rich grid interval and its surrounding grid interval is as follows:

Step S81, collecting the load consumption information of the surrounding grid intervals; let the number of grid intervals participating in the allocation be N;

Step S82, the allocation amount of each grid interval is allocated according to the following formula:

Among them, Q is the rich load in the rich grid interval, that is, 2% of the allocated load at the beginning of the day; y ₁ , y ₂ , y ₃ , y ₄ , y ₅ , and y ₆ are the factory load weighting coefficient and the commercial area load weighting respectively. coefficient, residential area load weighting coefficient, school load weighting coefficient, hospital load weighting coefficient and other places load weighting coefficient;

b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , and b ₆ are the ratio of the remaining load of the factory to the initial distribution load of the factory, the ratio of the remaining load of the commercial area to the initial distributed load of the commercial area, and the remaining load of the residential area. The ratio of the load to the initial allocated load of the residential area, the ratio of the remaining load of the school to the initial allocated load of the school, the ratio of the remaining load of the hospital to the initial allocated load of the hospital, and the remaining load of other places and the initial allocated load of other places proportion;

Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ , and Qi are respectively the factory load, the commercial area load, the residential area load, the school load, the hospital load, and the load at the _i -th other place;

Among them, y _j b _j Q _j is the redistributed charge amount for each grid interval; j takes a value from 1 to N.

The grid load power is proportioned according to the conditions of different grid intervals. The rich interval needs to give electricity to the outside, so the power needs to be adjusted to a certain extent. As an option, in the redistribution of the deficient grid interval, λ ₅ <λ ₄ <λ ₁ < λ ₂ =λ ₃ <λ ₆ ; in the redistribution of the rich grid interval, y ₁ <y ₃ =<y ₂ <y ₁ <y ₄ <y ₅ . Since the power protection area needs to keep its own power as much as possible when distributing to the outside, the power protection area needs to reduce the external distribution amount according to the power protection level; More power, so it is necessary to increase the internal ration according to the power protection level.

Preferably, the optimal load absorbing path is:

Step S101, taking the grid interval as the load node based on the active distribution network;

Step S102, referring to the distribution network path information database between load nodes, the grid interval that needs to be redistributed as a reference node, and retrieving the moving paths of the reference node passing through different load nodes according to each distribution network path, and calculating Calculate the moving cost of each path;

Step S103, setting the node with the smallest movement cost on a single, non-loop line to be the closest node relative to the reference node;

Step S104, all the nearest nodes are the delimited range of the grid interval around the rich grid interval or the deficient grid interval;

Step S105, the path from the reference node to the nearest node is set as the optimal load absorbing path.

The optimal consumption path can ensure that in the allocation process, each allocation path is allocated according to the condition of least consumption, so as to avoid unnecessary power consumption caused by path allocation.

The beneficial effects of the present invention are:

By fully considering the power protection level of the power protection area and the historical load, the electric field load is initially allocated; at the same time, the load consumption data in the circuit is collected in real time, and the surrounding grid interval is selected according to the load consumption state of the circuit to redistribute the charge. , and the charge redistribution needs to consider its own power, power protection level and other factors to ensure that the power supply area is given priority to power supply while completing the power mutual aid of each area on the active distribution network.

Description of drawings

Fig. 1 is a flow chart of the method adopted in the present invention.

Detailed ways

It should be understood that the embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

The technical solutions of the present invention are further described in detail below through the examples.

A power mutual aid method between grids of an active distribution network, comprising:

First, divide the grid interval; collect the historical information of the circuit breaker to obtain the estimated load consumption data of each grid interval; perform the initial distribution of electricity according to the estimated load consumption data:

In the initial allocation process, it is first necessary to fit the historical average daily load change data of users in each grid interval to form a load consumption prediction curve; calculate the daily load consumption of each grid interval according to the load consumption prediction curve.

The electricity needs to be allocated to the power protection area first; other areas are allocated load electricity according to the proportion of daily load consumption.

Second, collect the real-time information of circuit breakers to obtain the electricity load of each grid interval; mark the rich grid interval and the deficient grid interval according to the proportion of load consumption and initial distribution data:

The daily load consumption status is marked in real time and compared with the power consumption in the load consumption estimation curve; if the real-time power exceeds the predicted power of the load consumption estimation curve, the time point is marked and the time period exceeding the forecast power is recorded, and the cumulative record of this period is as t ₁ ; if the real-time power is lower than the predicted power of the load consumption estimation curve by more than 5%; mark the time point and record the time period lower than the predicted power, and the accumulated time period is recorded as t ₂ .

If t ₁ is greater than two hours, the interval is marked as a deficient grid interval; if t ₂ is greater than two hours, the interval is marked as a rich grid interval.

The marking of the rich section can ensure that the rich section has a certain amount of self-reserved power, while the deficient section needs to supplement the control of the power load urgently to reduce the downward trend.

Third, redistribute the load in each grid interval:

The load redistribution method for the starved grid interval is as follows:

Step 1, according to the topology of the active distribution network, obtain information about the location, energy storage capacity, and load accommodation information of the grid intervals around the deficient grid interval.

Step 2: Determine whether the surrounding grid interval is a deficient grid interval; the surrounding deficient network interval does not participate in this load redistribution.

Step 3, determine the power protection level of the grid interval; if the power protection level is higher than the grid shortage, it will not participate in the load redistribution; if the power protection level is lower than the shortage network zone, it will be weighted according to the power protection level. ; λ ₁ , λ ₂ , λ ₃ , λ ₄ , λ ₅ , λ ₆ are respectively the factory load weighting coefficient, the commercial area load weighting coefficient, the residential area load weighting coefficient, the school load weighting coefficient, the hospital load weighting coefficient and the load of other places. weighting factor;

Step 4: Analyze the energy storage capacity in the grid interval participating in this load redistribution; determine the redistributed load capacity according to the energy storage capacity:

Let the number of grid intervals participating in the allocation be N; the allocation amount of each grid interval is allocated according to the following formula:

Among them, Q is the load required in the grid-scarce interval; a ₁ , a ₂ , a ₃ , a ₄ , a ₅ , and a ₆ are the proportion of the remaining load of the factory and the initial distribution of the factory, and the remaining load of the commercial area. The ratio of the initial allocated load to the commercial area, the ratio of the residual load of the residential area to the initial allocated load of the residential area, the ratio of the remaining load of the school to the initial allocated load of the school, the ratio of the remaining load of the hospital to the initial allocated load of the hospital And the ratio of the remaining load of other places to the initially allocated load of other places;

Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ , and Qi are respectively the factory load, the commercial area load, the residential area load, the school load, the hospital load, and the load at the _i -th other place;

Among them, λ _j a _j Q _j is the redistributed charge amount for each grid interval; j takes the value from 1 to N.

The load redistribution method for the rich grid interval is as follows:

Step 1: According to the topology of the active distribution network, the location, energy storage capacity and load accommodation information of the grid intervals around the rich grid interval are obtained.

Step 2: Determine whether the surrounding grid interval is a rich grid interval; the surrounding rich grid interval does not participate in this load redistribution.

Step 3: Determine the power protection level of the grid interval; if the power protection level is higher than the wealthy grid interval, it will preferentially participate in load redistribution; if the power protection level is lower than the wealthy network interval, it will be weighted according to the power protection level. ; y ₁ , y ₂ , y ₃ , y ₄ , y ₅ , and y ₆ are respectively the factory load weighting coefficient, the commercial area load weighting coefficient, the residential area load weighting coefficient, the school load weighting coefficient, the hospital load weighting coefficient and the load of other places Weighting factor.

Step 4, analyze the energy storage capacity in the grid interval participating in the load redistribution; determine the redistributed load capacity according to the energy storage capacity:

Let the number of grid intervals participating in the allocation be N; the allocation amount of each grid interval is allocated according to the following formula:

Among them, Q is the rich load in the rich grid interval, that is, 2% of the distributed load at the beginning of the day; b ₁ , b ₂ , b ₃ , b ₄ , b ₅ , and b ₆ are the remaining load of the factory and the initial distribution load of the factory, respectively. The ratio of the remaining load in the commercial area to the initial allocated load in the commercial area, the ratio between the remaining load in the residential area and the initial allocated load in the residential area, the ratio between the remaining load in the school and the initial load in the school, and the remaining load in the hospital The ratio of the load to the initial allocation load of the hospital and the ratio of the remaining load of other places to the initial allocated load of other places;

Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ , and Qi are respectively the factory load, the commercial area load, the residential area load, the school load, the hospital load, and the load at the _i -th other place;

Among them, y _j b _j Q _j is the redistributed charge amount for each grid interval; j takes a value from 1 to N.

Step 5: Redistribute the load to each grid interval around the rich grid interval according to the optimal load absorbing path.

Third, redistribute the load to the scarce grid interval according to the optimal load absorption path:

Step S101, taking the grid interval as the load node based on the active distribution network;

Step S102, referring to the distribution network path information database between load nodes, the grid interval that needs to be redistributed as a reference node, and retrieving the moving paths of the reference node passing through different load nodes according to each distribution network path, and calculating Calculate the moving cost of each path;

Step S103, setting the node with the smallest movement cost on a single, non-loop line to be the closest node relative to the reference node;

Step S104, all the nearest nodes are the delimited range of the grid interval around the rich grid interval or the deficient grid interval;

Step S105, the path from the reference node to the nearest node is set as the optimal load absorbing path.

Fourth, collect the load consumption information of the redistribution day; adjust the proportion of the load consumption data of the day, and re-plan the distribution at the beginning of the next day.

Claims (10)

1. An inter-grid power coordination method for an active distribution network, the method comprising:

step S1, dividing the platform area into different grid intervals according to the function; marking a grid interval; acquiring historical information of the circuit breaker to acquire load consumption estimation data of each grid interval; performing initial distribution of electric quantity according to the load consumption estimation data;

step S2, acquiring real-time information of the circuit breaker to acquire the power load of each grid interval; marking rich grid intervals and deficient grid intervals according to the proportion of the load consumption and the primary distribution data;

step S3, carrying out load redistribution on the load of each grid interval;

step S4, collecting the load consumption information of the current day of redistribution; and adjusting the proportion of the load consumption data on the current day, and performing secondary planning on the initial distribution of the next day again.

2. The method of claim 1, wherein the inter-grid power coordination method for the active distribution network comprises: the load initial distribution steps are as follows:

s21: fitting historical daily average load change data of the users in each grid interval through a clustering algorithm to form a load consumption prediction curve;

s22: calculating daily load consumption of each grid interval according to the load consumption estimation curve;

s23: preferentially distributing power conservation areas; and distributing the load electric quantity of other areas according to daily load consumption ratio.

3. The method of claim 1, wherein the inter-grid power coordination method for the active distribution network comprises: the rich area and the lean area are divided as follows:

step S31, marking the daily load consumption state in real time, and comparing the daily load consumption state with the consumed power in the load consumption estimation curve;

step S32, if the real-time power exceeds the predicted power of the load consumption prediction curve, marking the real-time powerThe time point is set and the time period exceeding the predicted power is recorded, and the accumulated time period is recorded as t ₁ (ii) a If the real-time power is more than 5% lower than the predicted power of the load consumption prediction curve, marking the time point and recording the time period lower than the predicted power, wherein the accumulated record of the time period is t ₂ ；

Step S33, if t ₁ If the time is more than two hours, marking the interval as a deficient grid interval; if t ₂ If the time is more than two hours, the interval is marked as an affluent grid interval.

4. The method of claim 1, wherein the inter-grid power coordination method for the active distribution network comprises: the power retention rating is arranged as follows: hospital > school > factory > business area ═ residential area.

5. The method of claim 4, wherein the inter-grid power coordination method for the active distribution network comprises: the load reallocation method of the deficient grid interval comprises the following steps:

step S51, acquiring the position, the energy storage capacity and the load consumption information of the grid interval around the deficient grid interval according to the active distribution network topological structure;

step S52, judging whether the surrounding grid interval is a deficient grid interval; the peripheral deficient network interval does not participate in the current load redistribution;

step S53, judging the power protection level of the grid interval; if the electricity-keeping grade is higher than the lack grid interval, the electricity-keeping grade does not participate in the redistribution of the load; if the power retention level is lower than the deficient network interval, weighting and proportioning according to the power retention level;

step S54, analyzing the energy storage capacity in the grid interval participating in the current load redistribution; determining the redistributed load capacity according to the energy storage capacity;

and step S55, performing load redistribution to the deficient grid section according to the optimal load dissipation path.

6. The method of claim 5, wherein the inter-grid power coordination method for the active distribution network comprises: the method for confirming the shortage of the grid interval and the redistribution load capacity of the grid intervals around the shortage of the grid interval is as follows:

step S61, collecting load consumption information of surrounding grid intervals; setting the number of the grid intervals participating in distribution as N;

step S62, assigning the allocation amount of each grid interval according to the following formula:

wherein Q is the load quantity required by the deficient grid interval; lambda [ alpha ] ₁ 、λ ₂ 、λ ₃ 、λ ₄ 、λ ₅ 、λ ₆ Respectively a factory load weighting coefficient, a business area load weighting coefficient, a residential area load weighting coefficient, a school load weighting coefficient, a hospital load weighting coefficient and other site load weighting coefficients;

a ₁ 、a ₂ 、a ₃ 、a ₄ 、a ₅ 、a ₆ respectively comparing the remaining load capacity of the factory with the initial load capacity of the factory, comparing the remaining load capacity of the business area with the initial load capacity of the business area, comparing the remaining load capacity of the residential area with the initial load capacity of the residential area, comparing the remaining load capacity of the school with the initial load capacity of the school, comparing the remaining load capacity of the hospital with the initial load capacity of the hospital, and comparing the remaining load capacity of other places with the initial load capacity of other places;

Q ₁ 、Q ₂ 、Q ₃ 、Q ₄ 、Q ₅ 、Q _i the load capacity of a factory, the load capacity of a business district, the load capacity of a residential district, the load capacity of a school, the load capacity of a hospital and the load capacity of the ith other place are respectively;

wherein λ _j a _j Q _j Redistributing the electric charge quantity for each grid interval; j takes a value of 1 to N.

7. The method of claim 4, wherein the inter-grid power coordination method for the active distribution network comprises:

the load reallocation method for the rich grid interval comprises the following steps:

step S71, acquiring the position, energy storage capacity and load accommodation information of the grid intervals around the rich grid intervals according to the active distribution network topological structure;

step S72, judging whether the surrounding grid interval is an affluent grid interval; the surrounding rich network interval does not participate in the current load redistribution;

step S73, judging the power protection level of the grid interval; if the power guarantee level is higher than the rich grid interval, the power guarantee level preferentially participates in the redistribution of the load; if the power guarantee level is lower than the rich network interval, weighting and proportioning according to the power guarantee level;

step S74, analyzing the energy storage capacity in the grid interval participating in the load redistribution; determining the redistributed load capacity according to the energy storage capacity;

step S75 is to redistribute the load to each mesh interval around the rich mesh interval according to the optimal load sharing route.

8. The method of claim 7, wherein the inter-grid power coordination method for the active distribution network comprises: the method for confirming the surplus grid interval and the redistribution load capacity of the peripheral grid interval comprises the following steps:

step S81, collecting load consumption information of surrounding grid intervals; setting the number of grid intervals participating in distribution as N;

step S82, assigning the allocation amount of each grid interval according to the following formula:

wherein Q is the abundant load capacity of the abundant grid interval, namely 2% of the load capacity allocated at the beginning of the day; y is ₁ 、y ₂ 、y ₃ 、y ₄ 、y ₅ 、y ₆ Respectively a factory load weighting coefficient, a business area load weighting coefficient, a residential area load weighting coefficient, a school load weighting coefficient, a hospital load weighting coefficient and other place load weighting coefficients;

b ₁ 、b ₂ 、b ₃ 、b ₄ 、b ₅ 、b ₆ respectively comparing the remaining load capacity of the factory with the initial load capacity of the factory, comparing the remaining load capacity of the business area with the initial load capacity of the business area, comparing the remaining load capacity of the residential area with the initial load capacity of the residential area, comparing the remaining load capacity of the school with the initial load capacity of the school, comparing the remaining load capacity of the hospital with the initial load capacity of the hospital, and comparing the remaining load capacity of other places with the initial load capacity of other places;

Q ₁ 、Q ₂ 、Q ₃ 、Q ₄ 、Q ₅ 、Q _i the load capacity of a factory, the load capacity of a business district, the load capacity of a residential district, the load capacity of a school, the load capacity of a hospital and the load capacity of the ith other place are respectively;

wherein y is _j b _j Q _j Redistributing the electric charge quantity for each grid interval; j takes a value of 1 to N.

9. The method of claim 6 and 8, wherein the method comprises: in the redistribution of the starved grid interval, λ ₅ <λ ₄ <λ ₁ <λ ₂ ＝λ ₃ <λ ₆ (ii) a In the reallocation of rich grid intervals, y ₁ <y ₃ ＝<y ₂ <y ₁ <y ₄ <y ₅ 。

10. The method of claim 5 or 7, wherein the method comprises: the optimal load absorption path is as follows:

step S101, taking a grid interval as a load node based on an active distribution network;

step S102, referring to a power distribution network path information database among load nodes, taking grid intervals needing to be redistributed as reference nodes, searching the moving paths of the reference nodes passing different load nodes according to each power distribution network path, and calculating the moving cost of each path;

step S103, setting a single node with the minimum moving cost on the non-loop line as the nearest node relative to the reference node;

step S104, all nearest nodes are defined ranges of the rich grid sections or the grid sections around the deficient grid sections;

and step S105, setting the path from the reference node to the nearest node as an optimal load absorption path.

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